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El Niño–Southern Oscillation influences on the interannual variability of leaf appearance dates in central Siberia
Author(s) -
VicenteSerrano Sergio M.,
Delbart Nicolas,
Le Toan Thuy,
Grippa Manuela
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025000
Subject(s) - el niño southern oscillation , geopotential height , climatology , antarctic oscillation , southern oscillation , northern hemisphere , boreal , southern hemisphere , teleconnection , sea surface temperature , oscillation (cell signaling) , geology , pacific decadal oscillation , north atlantic oscillation , atmospheric sciences , environmental science , geography , biology , precipitation , meteorology , genetics , paleontology
This paper analyses the role of the El Niño–Southern Oscillation (ENSO) on the interannual variability of the leaf appearance dates of boreal forests in the Northern Hemisphere (1982–2004). We find significant negative correlations between the ENSO, quantified by means of the Southern Oscillation Index (SOI), and the leaf appearance dates in central Siberia with up to 9 months lag. The correlations between leaf appearance dates and summer Sea Surface Temperatures (SST) show a pattern that resembles the ENSO phenomena with positive and significant correlations in the East Pacific and negative in the West. These findings are explained by the role of SOI on Sea Level Pressures, 500 hPa Geopotential and the wind flow direction and intensity during the months of leaf appearance (April and May) and on average temperatures, which determine noticeably the date of leaf appearance.